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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% | 35.00% | 35.00%
Investment in qualified affordable housing tax credits amortization |  | $ 10,278 | $ 7,300 | $ 6,664
Current Federal Tax Expense (Benefit) |  | 1,200 |  |
Deferred tax assets: |  |  |  |
Allowance for loan losses |  | 10,498 | 17,719 |
Accumulated other comprehensive loss – Pension plan |  | 7,098 | 7,937 |
Accumulated other comprehensive loss – Unrealized losses on securities |  | 946 | 1,618 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation |  | 2,744 | 4,140 |
Deferred compensation |  | 1,327 | 2,322 |
Net deferred loan fees |  | 1,115 | 1,397 |
Deferred contract bonus |  | 645 | 1,074 |
Nonvested equity-based compensation |  | 1,069 | 1,115 |
Fixed assets |  | 877 | 781 |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Legal Settlements |  | 4 | 793 |
Other |  | 1,226 | 2,525 |
Total deferred tax assets |  | 27,549 | 41,421 |
Deferred tax liabilities: |  |  |  |
Deferred investment income |  | 6,120 | 10,199 |
Pension plan |  | 19,076 | 26,344 |
Mortgage servicing rights |  | 2,034 | 3,243 |
Partnership adjustments |  | 460 | 549 |
Other |  | 364 | 596 |
Total deferred tax liabilities |  | 28,054 | 40,931 |
Net deferred tax (liability) asset |  | (505) |  |
Deferred Tax Assets, Net |  |  | $ 490 |
Change in Accounting Method Accounted for as Change in Estimate [Member] |  |  |  |
Investment in qualified affordable housing tax credits amortization |  | $ 3,100 |  |
Subsequent Event [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |

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- Definition Amount of amortization expense of investment in qualified affordable housing projects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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